Patent GB-1097993-A (GB)
Title: Improvements in closure assemblies and bolt mechanisms
IPC: E05C3/12
Filed: 1966-01-04
Abstract: 1,097,993. Bolt fastenings. AERPAT A.G. Jan. 4, 1966 [Jan. 4, 1965], No. 319/66. Addition to 1,083,327. Heading E2A. A bolt mechanism for releasably fastening to a frame member B a plate-like closure member A which is hinged to the frame member and has a slot C therethrough, comprises a bracket 8 having flanges 8d, 8e, and an open central area between the flanges, the bracket being adapted to be mounted on the back side of the closure member with the flanges secured to the back side of the closure member and extending therefrom with the open central area registering with the slot, the bolt mechanism further comprising a bolt 1, mounted for pivoting movement on the bracket, the bolt having a latch arm la located behind the back side of the closure member (when the mechanism is mounted as aforesaid) and positioned to engage the frame member when the bolt is in the fastening position, the bolt also having a longer arm 1b, extending (when the mechanism is mounted as aforesaid) through said slot when it is in the unfastening position and forming an operating lever for the bolt, the lever (when the mechanism is mounted as aforesaid) being located within the slot with its outer surface substantially flush with the outer face of the closure member when the bolt is in the fastening position; a trigger member 2 carried by the bracket and having an actuator portion 2a located in an end portion of the slot adjacent to the free end of the lever, the exposed surface of the actuator portion being substantially flush with the outer face of the closure member (when the mechanism is mounted as aforesaid), means carried by the bracket supporting the trigger member for sliding movement towards and away from the end of the lever parallel (when the mechanism is mounted as aforesaid) with the outer surface of the closure member, a wall 25a on the bolt lever in the fastening position; spring means 5 normally urging the trigger member into holding engagement with the lever; the spring means supported by the bracket engaging the bolt, urging it for rotation about its pivot to a position to release the closure member (when the mechanism is mounted as aforesaid) when the trigger member is retracted from the wall, the bracket being of U-shaped channel section with the side wall, terminating in the aforesaid flanges and arranged so that (-when the mechanism is mounted as aforesaid) the said side walls are disposed on opposite sides of the slot with the web of the channel portion spaced from and parallel with the closure member, the support means for the trigger member comprising a supporting block 3 mounted between the side walls of the bracket, the block having a horizontal slot 3a formed throughout its width and located below and [parallel to the lower face of the closure member, the trigger member including a supporting plate portion 2c located within the said slot of the block and slidable therein and a supporting stem 2b extending from the supporting plate portion through an opening in the block intermediate the ends of the sipt in the block to support the actuator portion of the trigger member. The spring means for rotating the bolt comprises a helical spring arranged between the side walls of the bracket and having one transversely extending end portion engaging a portion of the bracket and the other end portion engaging the bolt, the bracket having integral tongue portions bent from the side walls thereof and extending inwardly into the end portions of the helix of the spring